Review on 🔢 Non-Contact Digital Tachometer RPM Tester with LCD Backlight Display - 2.5~99999 RPM Range, 50mm~500mm Distance, Rotational Speed Meter, Tacho Speedometer by Leslie Matlak

This little all plastic RMP meter comes with a vinyl sleeve and several strips of reflective tape. You cut the ribbon into small pieces. You can stick a piece on the anchor of the desired measurement object. You can also add 2 items for more precision and there is a setting for that. It runs on 3 AAA batteries that you need. The 2 button design keeps it simple and seems adequate for the functions it performs. . The save button saves the measurement on the screen for recording. Cheap and efficient. I don't see any certification and calibration information. You can invest in a more expensive model if needed. Otherwise this should work fine for most simple RPM measurement needs. 4 solid stars.